package com.foreknow.controller;

import com.foreknow.service.GuestbookService;
import com.foreknow.service.impl.GuestbookServiceImpl;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.List;

public class ManageSevlet extends HttpServlet {

    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        //我们只需 要在doGet中获取到请求的参数q=list，然后根据获取到的参数来决定调用哪一个方法
        String method = req.getParameter("q");
        if("delete".equals(method)) {
            delete(req,resp);
        }else if("update".equals(method)){
            update(req,resp);
        }else {
            list(req,resp);
        }
    }

    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        doGet(req, resp);
    }

    //查询所有信息的方法
    protected void list(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
//        resp.setContentType("text/html;charset=utf-8");
        PrintWriter out = resp.getWriter();
        //调用业务层查询方法
        GuestbookService service = new GuestbookServiceImpl();
        List<Object> list = service.queryInfo();
        System.out.println(list.size());
        //将查询到的list集合保存到服务器端
        req.setAttribute("key",list);
        //之后就可以将这个请求转发给list.jsp
        req.getRequestDispatcher("/list.jsp").forward(req,resp);
    }

    //删除
    protected void delete(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        //设置服务器端向客户端响应的内容的类型(MIME)   这一行代码是固定的 必须写的
//        resp.setContentType("text/html;charset=utf-8");
//        //设置客户端向服务器端请求的字符编码集为utf-8    必须写的
//        req.setCharacterEncoding("utf-8");
        //获取请求参数
        String id = req.getParameter("id");
        GuestbookService service = new GuestbookServiceImpl();
        boolean isRight = service.deleteGuestbookById(Integer.parseInt(id));
        if (isRight){
            req.getRequestDispatcher("/user/manager?q=list").forward(req,resp);
        }else{
            System.out.println("delete error.....");
        }
    }

    //修改
    protected void update(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {

    }
}
